The Celtics would have needed to take a big in the draft regardless of Perk's injury. I wish he is back in training camp, because he's important to the team, and he'll be in a contract year, he's earned his chance to get a good contract.
About the draft, Danny won't follow the Best Player Available rule throughout the draft. He will draft the best talent with 19th and then with the second (or more if they buy another pick) pick he'll draft a prospect to develope in a different position. He won't draft two SG/SF, because he'll be trying to develope assets for 2012's summer.
So if Sanders, Whiteside, Orton or Udoh are around at 19, I think he'll grab one, if not, he'll draft a wing and draft a big with a bought late first round pick (Alabi) or with 52nd pick (Pittman). I'd like to have James Anderson, Larry Sanders and Da'Sean Butler, but that'd mean a lot of luck and buying a late first round pick. In two years they could develope and be the "little three" or good trade assets to reload.
Go Celtics!!! Perk, get well soon...